Continuity mistake: The painting changes from the time it is made until the time the detective looks at it.
Blackmail (1929)
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Directed by: Alfred Hitchcock
Starring: Anny Ondra, Charles Paton, John Longden, Sara Allgood
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More mistakes in Blackmail
Tracy: Detectives in glass houses shouldn't wave clues.
Trivia: Hitchcock's cameo is towards the beginning on the train. The little boy is playing with his hat.